Roller-base lifting-jack



s; PIB/Amies( ROLLER BASE LIFTING JACK.' APPLICATION FILED JUNE 20,IQ'IB.v RENEWEL) JAN. 28,'1919Iv AFQSLA Patented m20, 1921;'

' 2 SHEETS-*SHEET I.

1 muum IIIIILIILIIIII A TORlI/EYS S. P. BARKER.

ROLLER BASE LIFTING ACK. APPL13A1`10N F1LED1uNE2o.1918. RENEWED1.111.213.1919.

Patented Dec. 20, 1921..

lAOSl 2 SHEETS-SHEET 2.

A TTURNEYS 11m/w01? 5. P. Ear/ref;

W/T/VESSES 's l`aaliuon or New Yoan.

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SYDNEY P. BAB/RER, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS,T0

ABRW GRIP MANUFACTURING C0., INC., 0F GLENS FALLS, NEW YORK, A. CORP()lEtLLEIEt-BASE LIFTING-JCK.

Application led June 20, 1918, Serial No. 240,976. Renewed January 28,19l9. vvSeria1 No. 273,690. 'I

To all yifi/rom it may concern.'

Be it known that I, SYDNEY I. BAKKER,

a citizen of the United States, and a resident whereby the jaclr may beeasily put into or' taken out of place beneath the vehicle axle or thelike without requiring the operator to stoop or reach beneath thevehicle. While I show and refer herein to the device as a hand operatedlifting jack it is to be understood that the field of usefulness of theiml'irovement is not to be restricted unnecessarily.

Stated more particularly I provide a lifting jack with a base, or a baseto be attached to a lifting jack, roller supporting means movablerelatively to the base and resilient means acting on the rollersupporting means and the base, the elements specified being so combinedand arrangedvthat the roller supporting means normally acts on theground and the jack and base derive their normal support from the rollersupporting means and are normally held above or free from the ground,thus providing for the easy transportation or manipulation of the jackin placing the same beneath the axle or other load to be lifted or'vhile removing the same from the operating position, but permitting thebase to move downward relatively to the roller supporting means intopositive and direct engagement with the ground when the load is broughtto bear upon the jack, the resilient means acting automatically torestore the roller supporting means to normal or jack supportingposition when the load is relieved from the jack.

The mechanism for accomplishing the foregoing objects may be representedin various ways, and hence I do not wish to be limited to any of theVspecific details illustrated so long as the broad aspects of theinvention obtain, but in order to illustrate one or more practicalembodiments of my improvement reference is made to the accompanyingdrawings, similar reference characters being applied to like partsthroughout the several figures` and fof which- Figure 1 is a sideelevation' of one formy of my improvement in its normal position as whenthe jack is being rolledbeneath the vehiclelaxle or other load to behoisted and supported.

Fig. 2 is a similar view but indicating the change of position of thejack at the moment the axle is about to be lifted, the base having beenforced down into direct, positive and frictional engagement' with theground.

Fig. 3 is a plan view of the base attach- -ment as it would be seen fromthe plane of the line .3-3 of Fig. 1, a corner portion of the structurebeing broken away to more clearly indicate the manner of assemblage.

Fig. el is a vertical longitudinal section of a modilication on the lineLl-l of Fig. 6, the anti-friction rollers being indicated in the samerelative position to the base as in F ig. l.

Fig. 5 is a view similar to Iig. 4, but showing` the changed positionofthe parts asin Fig. 2; and

Fig. 6 is a bottom plan view of thesame.

Referring now more specifically to the accompanying drawings, l0represents a lifting jack of any suitable or approved design orconstruction having a plunger 11, an operating member l2, and anysuitable power multiplying devices acting between the operatingmemberand the vertically movable plunger.

According to the usual practice in order to position a lifting jackbeneath an axle, such as indicated at A and representing any load to besupported, it is necessary for the operator to stoop or crawl wellbeneath the vehicle body, especially if the vjack is a heavy andcumbersome one. It will thus be appreciated lthat it is highly desirablefor a jack for transportation purposes or for shoving it beneath theobject to be lifted or removing it from such position, to be providedwith anti-friction roller supporting means and -with means inconjunction with said supporting means normally to hold the 'jack freeand clear from the ground, thereby rendering it an easy matter for theoperator through the manipulation of the operating Ill@ member' to rollthe ack from place to place or into or out of hoisting position. It isalso essential that the anti-friction means should be so supported as toyield to the load brought to bear upon the jack in order to insurepositive, direct and frictional contact between the base of the jack andtheground. In the construction shown and as preferred, the anti-frictionroller supporting means consists of four rollers 13 which are movablyassociated with the base portion of the jack, either directly or with asupplemental base 14 detachably connected to the main portion ofthejack, one of the rollers being arranged adjacent each corner of thebase.

In the specific embodiment disclosed thejaxle l 15 of each roller is somounted or connected to the base 14 as to swing' with its. roller aroundthe axis of a pivot connectlon 16 whereby the roller is adapted to moveup and down with relation to the base 14.

The structure in the first three figures is one in which the auxiliarybase 14 is made of a solid block of material such as wood whereby thejack is adapted to be supported upon the ground with a minimum amount ofslippage while sustaining the load. Being made of wood-the base 14 mayreadily be attached to the main portion of the jack by means of screws17 or the like. This base is transversely bored at 18 adjacent andparallel to the ends thereof.

The wheels 13, constituting the only members that touch the groundwhilet'he jack is unloaded and in portable condition, are

all severally journaled on oscillating arms or bell vcranks 19 which inturn are pivoted upon the pivot rods or connections 16 extending throughthe parallel holes 18. As shown in Fig. 3 each of the bell cranks istapped at one end 21 to receive the journal or axle 15 on which theadjacent wheel is journaled for free rotation. The axle 15, however, ispreferabl permanently fixed to the threaded end o the bell crank so asto prevent unscrewing of the axle and displacement or loss of the wheelthereon. The bell cranks 19 are arranged in pairs, the members of eachpair being mounted u on the ends ofthe pivot connection 16. ne bellcrank of each pair may be said to be paired with the bell crank of theother pair that lies on the same side of the base 14. In other words forconvenience of description the rollers may be regarded as arranged inend pairs'and also in side pairs. The rollers 13 are acted on byresilient means which normally project their lower portions below` theunder surface of the base 14, and yet permit said base to bear downsquarely and directly upon the grbund under the pressure of the loadupon the ack. In the embodiment disclosed the end members of the bellcranks of each side pair of bell cranks are directed more or lesstowardeach other and connecting them is a coil spring bear upon the jackin the ordinary operation thereof the springs are put under ten silestrain while the bell cranks oscillate around the axes of the pivotconnections 16 and rise relatively while. the spring-connected ends ofthe bell cranks swing downward toward the ground.

The yielding action of each roller is preferably independent of theothers. For example and in the embodiment disclosed each wheel supportor bell crank is free to rotate around the pivot connection 16 except asabove described, that is to say, any of the rollersmay oscillate aroundthe axis of the pivot 16 independently of the others so if the jackshould be operated over cobble stones or any other uneven surface therollers will naturally accommodate themselves to slich surface withoutmaterial resistance.

actuated by the same spring will always tend .to swing downward belowthe lower surface of the base 14 to substantially the same extent.l

Instead of making the base 14 of wood and attaching it to the mainportion of the jack by screws or the like it may be made of metal eitheras a separate part or as a part of the main portion of the jack as maybe found most suitable. In Figs. 4, 5 and 6 I represent thel improvementas constituting an integral part of the jack base or casing, the base 14being in the nature of a hollow rectangle open at the under side and ofsuficient strength to sustain any load that may be brought to bear uponthe jack, the same being shown as including side and end flanges 24 and25 deep enough to house the rollers 13 and the oscillating members uponwhich they are journaled.A The bell cranks 19 are or may besubstantially the same as those already described and hence aresimilarly indicated by reference characters as well as the springs 23constituting the direct connections between the side pairs of rollersupports. By this form of construction I providea jack base thatoccupies no more extent in length or width than the ordinary jack baseand with but slight additional height. Hence for the purpose of storagein the tool box, the form shown on the second sheet of drawings is muchmore compact than that on the first sheet although for some purposes thefirst form indicated may be preferable in that a wider rolling supportfor transportation of the jackalong the ground is afforded by the woodenbase having the rollerspivoted thereto on the outside. The pivotconnections 16 areconnected to the metal base simply by drilling airs ofalined holes in the side flanges 24.

he bell cranks and the rollers are so proportioned in this constructionas to afford ample freedom of movement of the rollers with respect tothe portions of the pivot connections within the open space in the base.The operation of this form of the invention is essentially the same as,that already described.

l claim:

l. In a lifting jack, a rigid base adapted to bear directly upon theground and so sus-V tain the load brought upon the jack, a series ofanti-friction rollers adjacent to the corners of the base, and meansconnecting said rollers resiliently to the base, said connecting meansincluding a series of oscillating members, one for each roller, andspring means acting upon the oscillatory members and serving to elevatethe base free from the ground when the jack is unloaded.

2. lln a lifting jack, the combination of a base adapted to beardirectly upon the ground and so support the entire load brought to, bearupon the jack, a plurality of bell cranks, pivdt means connecting thebell cranks to the base on horizontal axes, an anti-friction rollerjournaled on one end of each bell crank and movable in a vertical planewith the bell crank around the pivot thereof, and spring means actingconstantly upon the other end of each bell crank tending i to swing theroller downward below the bottom of the base.

3. ln a lifting jack, the combination of a rectangular base having holesformed therethrough parallel to the ends of the base, a pair of pivotVmembers extending through said holes, an end pair of bell cranks mountedupon. each pivot connection and adapted to oscillate in vertical planesadjacent to the corners of the base, an anti-friction roller carried byone arm of each bell crank, and coil springs connected to the arms of'the bell cranks remote from the ends supporting the rollers and tendingto project the rollers downward below the bottom of the base butyielding under the weight of the load brought to bear upon the jack toallow the base to bear directly and frictionally uponthe ground.

el. The herein described base for a liftinu" C jack comprising a strongrigid load supportvlng member adapted to engage directly and thereby,anti-friction rollers mounted to oscillate in vertical planes upon saidpivot members, and resilient means acting upon the rollers tending toproject them below the bottom surface of the base.

6. ln a portable load-supporting jack, a hollow rectangular jackcarryingbase open at its under side and formed for stable engagement with theground, a plurality of rollers movably mounted within the; base, oneadjacent each corner thereof and movable through the open under side andresilient means acting between the rollers and base normally to hold thebase free from the ground and also to permit the base to move downwardinto contact with the ground consequent to the application of loadingpressure on the jack whereby under the pressure of the load said basewill assume the function of supporting the jack in a position to whichit may be moved on the rollers, each roller being yieldable relativelyto the baseindependently of the other rollers.

7. ln a portable load-supporting jack, a hollow rectangularjack-carrying base open at its under side and formed for a stableengagement with the ground, a plurality of rollers movably mountedwithin the base, one. adjacent each corner thereof and movable throughthe open under side and resilient means acting between the rollers andthe base normally to hold the base free from the ground and also topermit the base to move downward into direct contact with the groundconsequent to the application of loading pressure on the jack wherebyunder the pressure of the load said base Ywill assume the function ofsupportin the jack in a position to which it may e moved on the rollers.

SYDNEY P. BARKER.

